Abstract
Measurements of alkalinities and calcium concentrations in the Baltic Sea indicate that there has been a slight increase in both these parameters over the last century. These increases may have been caused by the leaching of limestone by acid rain. About ten percent of the nutrients are exported from the Baltic to the Kattegat; however, very little, if any, alkalinity is stored in the Baltic since river input and system output are approximately equal. Since the precipitation and evaporation are almost equal in the Baltic Sea, corrections are not needed for river inputs.

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